The `join()` function in Python is used to concatenate the elements of an iterable (like a list or tuple) into a single string. The elements are joined together using a specified separator.
Syntax
separator_string.join(iterable)- separator_string: The string that will be placed between each element of the iterable. - iterable: The iterable containing strings to be joined. The elements must all be strings.
Example 1: Joining a List of Strings
```python words = ["Hello", "world", "this", "is", "Python"] separator = " " sentence = separator.join(words) print(sentence) ```Output
``` Hello world this is Python ```Explanation - The list `words` contains several strings. - The `join()` function is used with a space `" "` as the separator to combine the elements into a single string, resulting in a sentence.
Example 2: Joining a List of Strings with a Comma
```python fruits = ["apple", "banana", "cherry"] separator = ", " result = separator.join(fruits) print(result) ```Output
``` apple, banana, cherry ```Explanation - The list `fruits` contains the names of different fruits. - The `join()` function uses a comma followed by a space `", "` as the separator to join the elements into a single string.
Example 3: Joining with an Empty String (No Separator)
```python letters = ["P", "y", "t", "h", "o", "n"] result = "".join(letters) print(result) ```Output
``` Python ```Explanation - The list `letters` contains individual characters of the word "Python". - The `join()` function is used with an empty string `""` as the separator, resulting in the characters being joined together without any space between them.
Example 4: Joining a Tuple of Strings
```python
names = ("Alice", "Bob", "Charlie")
separator = " & "
result = separator.join(names)
print(result)
```
Output
``` Alice & Bob & Charlie ```Explanation - The tuple `names` contains different names. - The `join()` function uses the separator `" & "` to join the names together in a single string. Important Notes - All elements in the iterable must be strings. If they are not, you’ll need to convert them to strings using `str()` before using `join()`. - The `join()` function does not modify the original iterable but returns a new string.